[diesel_mercedes] '81 240D wildly fluctuating fuel gauge

 

Since recently replacing the instrument cluster in my '81 240D so that I would have the amazing luxury of a working odometer, I have a bizarre fuel gauge.  It flits around quite a bit, and sometimes flies back and forth from full to empty and back.  Sometimes the movement is less pronounced, say from full to 3/4.  This movement is not constant - sometimes the gauge is just fine.  The temp gauge also fluctuates sometimes, but not nearly as much.  The oil pressure gauge is rock steady all the time.

Is this a common situation, and is there a fix?  I can estimate fuel usage as long as the odometer is working, but it would be nice to have a steady fuel gauge.

By the way, I got 28.5 mpg on the tank I filled today.  Not bad for around-town driving.

Thanks in advance for the feedback.

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